Last Activity:03-21-2017 12:05 PM
Likes Given: 10
67 Likes on 54 Posts
Posted in thread: Spam on 02-11-2017 at 02:39 PM
Is anyone else getting spam messages on this site? I seem to be getting one a day starting
Posted in thread: 2-Stroke Design: Port Timing Round 2 on 02-06-2017 at 07:42 PM
Low cost industrial engines use the porting system pictured below. The slugs in the pictures
are guides for port modifications. The widths, angles, and timing are important. I can provide
details if y...
Posted in thread: PatWankel Rotary Engine on 02-04-2017 at 02:55 PM
I think you are on the right track, but making the seal "rings" with enough precision will be
challenging. I still think the problem area will be where the spherical outer surface
transitions to the f...
Posted in thread: PatWankel Rotary Engine on 01-24-2017 at 01:20 PM
That will work with both cutting tools and a grinder mounted like common ball cutters. The next
problem is machining the seal slots in the outer body. To follow the inner body their location
Posted in thread: PatWankel Rotary Engine on 01-12-2017 at 12:11 PM
Thanks. For some reason I didn't realize that the seals were in the outer case. However,
everything I said about an accurate and smooth surface is still true. It just needs to be on
the inner element....
Posted in thread: Timing for SI 2-stroke? on 01-12-2017 at 12:01 PM
QUB is Queens University of Belfast. The late Gordon Blair did a lot of the basic research
there that lead to the modern two stroke design. Unlike most two stroke developers, he
published his work and...
Posted in thread: Timing for SI 2-stroke? on 01-11-2017 at 04:15 PM
This may be a little late, but a better design for a cross flow scavenged engine is the QUB
crossflow design. It has a better combustion chamber shape and should be easier to
Posted in thread: PatWankel Rotary Engine on 01-11-2017 at 12:49 PM
I doubt that milling will leave an accurate and smooth enough surface on the outer case to get
good sealing. However, a CNC grinding machine should be able to produce an accurate surface in
the same w...
Posted in thread: PatWankel Rotary Engine on 01-10-2017 at 02:27 PM
Fascinating. The problem with the Wankel, Liquid Piston, and similar concepts has always been
sealing. Their designs were 2D concepts that could be made accurately with 20th century
methods. However, ...
Posted in thread: piston ring materials on 12-03-2016 at 03:23 PM
I got the very small amount of ductile cast iron I needed from McMaster-Carr. While I'm just
starting to make rings, the machining process seems to go very well. The usual recommendation